<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
      <div class="title border-topbottom">当前城市</div>
      <div class="button-list">
        <div class="button-wrapper">
          <div class="button">{{this.currentCity}}</div>
        </div>
      </div>
    </div>
    <div class="area">
      <div class="title border-topbottom">热门城市</div>
      <div class="button-list">
        <div class="button-wrapper" v-for="item in hotCities" :key="item.id" 
        @click="handleCityClick(item.name)">
          <div class="button">{{item.name}}</div>
        </div>
      </div>
    </div>
      <div class="area" v-for="(value,key) in cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div> 
        <div class="item-list">
          <div class="item border-bottom" v-for="item in value" :key="item.id" 
           @click="handleCityClick(item.name)">{{item.name}}</div>            
        </div> 
      </div>
    </div>
  </div>
</template>

<script>

import Bscroll from 'better-scroll'
// let wrapper = document.querySelector('.wrapper')
// let scroll = new BScroll(wrapper, {})
import { mapState,mapMutations } from 'vuex'
export default {
  name:'CityList',
  props:{
    cities: Object,
    hotCities :Array,
    letter :String
  },
  data(){
    return{

    }
  },
  mounted() {
      this.$nextTick(() => {
        this.scroll = new Bscroll(this.$refs.wrapper, {})
      })
  },
  computed: {
    ...mapState({
      currentCity:'city'
    })
  },
  watch:{
    letter(){
      if(this.letter){
        // var a = this.letter
        // console.log(a);
        
        let element = this.$refs[this.letter][0]
        // console.log(element);
        this.scroll.scrollToElement(element,500)
      }
    }
  },
  methods:{
    handleCityClick(city){
      this.changeCity(city)
      this.$router.push('/')      
    },
    ...mapMutations(['changeCity'])
  }
}
</script>

<style lang="stylus" scoped>
@import '~@/assets/styles/varibles.styl'
  .border-topbottom
    &:before
      border-color :#ccc
    &:after
      border-color :#ccc   
  .border-bottom
    &:before
      border-color :#ccc 
  .list
    overflow :hidden
    position :absolute  
    top :1.58rem 
    left :0
    right :0
    bottom :0
    .title
      line-height .54rem
      background :#eee
      padding-left :.2rem
      color :#666
      font-size :.26rem
    .button-list
      overflow :hidden
      padding :.1rem .6rem .1rem .1rem
      .button-wrapper
        float :left
        width :33.33%
        .button
          margin :.1rem
          padding :.1rem 0
          text-align :center
          border: .02rem solid #ccc
          border-radius :.06rem
    .item-list
      .item
        line-height :.76rem
        padding-left :.2rem      
</style>
